(ESN) Table 19a: Percentage of schools where 13-year-old students are
assigned to math classes based on ability, percentage of 13-year-old students
who do group problem-solving in math class at least once a week, and
percentage of 13-year-old students who take a math test or quiz at least once
a week, by country: 1991

NOTE: Differences exist in the samples of students questioned that may
account for a difference in results between the United States' averages on the
two questionnaire administrations, the IAEP and the NAEP. See supplemental note to Indicator 19
for details on data and sample sizes from
Canada, Emilia Romagna (Italy), England, Israel, Portugal, Scotland, the
Soviet Union, Spain, Switzerland, and the United States; for discussions of
the frequency of ability grouping, working in small groups, and classroom
testing; the International Assessment of Educational Progress (IAEP); the
National Assessment of Educational Progress (NAEP); and comparing
questionnaire results of the IAEP and the NAEP.